145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Sebastian Pancratz
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include "fmpz_vec.h"
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#include "padic.h"
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#include "qadic.h"
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#define FLINT_SRC_CPIMPORT "../qadic/CPimport.txt"
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#ifndef FLINT_CPIMPORT
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#define FLINT_CPIMPORT FLINT_SRC_CPIMPORT
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#endif
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void qadic_ctx_init_conway(qadic_ctx_t ctx,
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const fmpz_t p, slong d, slong min, slong max,
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const char *var, enum padic_print_mode mode)
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{
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char *buf;
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FILE *file;
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if (fmpz_cmp_ui(p, 109987) > 0)
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{
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flint_printf("Exception (qadic_ctx_init_conway). Conway polynomials \n");
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flint_printf("are only available for primes up to 109987.\n");
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abort();
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}
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buf = flint_malloc(832);
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file = fopen(FLINT_CPIMPORT, "r");
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if (!file)
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file = fopen(FLINT_SRC_CPIMPORT, "r");
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if (!file)
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{
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file = fopen("CPimport.txt", "r");
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if (!file)
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{
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flint_printf("Exception (qadic_ctx_init_conway). File loading.\n");
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abort();
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}
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}
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while (fgets(buf, 832, file))
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{
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char *tmp = buf;
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/* Different prime? */
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if (fmpz_cmp_ui(p, atoi(tmp)))
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continue;
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while (*tmp++ != ' ') ;
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/* Same degree? */
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if (d == atoi(tmp))
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{
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slong i, j;
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char *ptr;
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/* Find number of non-zero coefficients */
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ctx->len = 1;
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ptr = tmp;
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for (i = 0; i < d; i++)
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{
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while (*ptr++ != ' ') ;
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if (atoi(ptr))
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ctx->len ++;
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}
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ctx->a = _fmpz_vec_init(ctx->len);
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ctx->j = flint_malloc(ctx->len * sizeof(slong));
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/* Copy the polynomial */
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j = 0;
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ptr = tmp;
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for (i = 0; i < d; i++)
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{
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int coeff;
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while (*ptr++ != ' ') ;
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coeff = atoi(ptr);
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if (coeff)
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{
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fmpz_set_ui(ctx->a + j, coeff);
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ctx->j[j] = i;
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j++;
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}
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}
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fmpz_set_ui(ctx->a + j, 1);
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ctx->j[j] = d;
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/* Complete the initialisation of the context */
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padic_ctx_init(&ctx->pctx, p, min, max, mode);
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ctx->var = flint_malloc(strlen(var) + 1);
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strcpy(ctx->var, var);
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fclose(file);
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flint_free(buf);
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return;
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}
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}
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fclose(file);
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flint_free(buf);
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flint_printf("Exception (qadic_ctx_init_conway). The polynomial for \n");
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flint_printf("(p,d) = (%wd,%wd) is not present in the database.\n", *p, d);
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abort();
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}
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